First commit for private source control. Older commits available on Github.

Assets/Scripts/Framework/Managers/Player/Data/Inventory/Backpack.cs

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+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+namespace BriarQueen.Framework.Managers.Player.Data.Inventory
+{
+    public class Backpack
+    {
+        private readonly List<ItemDataSo> _items = new();
+
+        public IReadOnlyList<ItemDataSo> Items => _items;
+
+
+        public void AddItem(ItemDataSo item)
+        {
+            if (_items.Any(x => x.UniqueID == item.UniqueID))
+                return;
+
+            Debug.Log($"Adding item {item.UniqueID}");
+
+            _items.Add(item);
+        }
+
+        public void RemoveItem(ItemDataSo item)
+        {
+            if (_items.All(x => x.UniqueID != item.UniqueID)) return;
+
+            _items.Remove(item);
+        }
+
+        public void RemoveItem(string uniqueID)
+        {
+            var item = _items.FirstOrDefault(x => x.UniqueID == uniqueID);
+
+            if (item) _items.Remove(item);
+        }
+
+        public void ClearItems()
+        {
+            _items.Clear();
+        }
+    }
+}

Assets/Scripts/Framework/Managers/Player/Data/Inventory/Backpack.cs.meta

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+fileFormatVersion: 2
+guid: 855a4eee12334e29938a4b6c564aa157
+timeCreated: 1769701500